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Copper pipe

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Copper pipe

Unread postAuthor: Lockednloaded » Sun Mar 14, 2010 9:47 pm

In the world of PVC, 3/4 fittings go into 1 1/4" pipe, 1 1/4 fittings fit in 2" pipe etc.. but i'm totally unfamiliar with copper. I was wondering, does a 3/4" copper fitting fit into 1"pipe or fittings, and would a 3/4" of 1/2" cap be a better piston inside 1" pipe?
Sorry, but i searched and did not find anything, your help is appreciated
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Unread postAuthor: nosnik » Sun Mar 14, 2010 9:54 pm

im not sure too.. >_> u can try asking your local hardware store. :)
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Unread postAuthor: deathbyDWV » Sun Mar 14, 2010 10:26 pm

I don't think any copper really fits with PVC. I'd suggest a 3/4 inch PVC cap for a piston with the sides shaved off so if fits...
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Unread postAuthor: Lockednloaded » Sun Mar 14, 2010 10:32 pm

i;m not talking about copper w/ pvc, just copper, sorry for any confusion that may have caused.
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Unread postAuthor: nosnik » Sun Mar 14, 2010 10:39 pm

fittings for just copper alone?, you prolly have to play around to find the best fits.
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Unread postAuthor: ramses » Mon Mar 15, 2010 4:05 pm

Mcmaster has technical drawings for most of their items. You could check there. I imagine most copper endcaps for example are very close to the same size, even from different distributors.
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Unread postAuthor: irisher » Mon Mar 15, 2010 4:08 pm

They do not. The reason PVC fits is because of the wall thickness. Copper is much thinner and therefore will not fit snugly in the next size up.
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Unread postAuthor: Lockednloaded » Mon Mar 15, 2010 10:52 pm

i don't exactly need a snug fit, just kind of close, will a 3/4" fitting fit into 1" pipe? it needs the be close enough to jb weld together
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Unread postAuthor: Hawkeye » Tue Mar 16, 2010 8:25 am

Quite a few copper and pvc fittings do fit together almost perfectly. Not too many fit together in the proper way though. I have a bunch of pieces lying around and could give you an idea of what may work.
Still, if you're going to use copper you might as well go all copper. It just makes a much better looking gun and it is very versatile.
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Unread postAuthor: Lockednloaded » Tue Mar 16, 2010 9:48 am

Thanks, thats what i'm looking for, they don't need to be perfect fit, just pretty close. And i will be going almost all copper, definitely all metal
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Unread postAuthor: jrrdw » Tue Mar 16, 2010 10:47 am

Copper fittings to copper pipe is basicly 1:1. A 3/4" end cap fits over the end of a 3/4" pipe, there for about 1/4" smaller then a 1" pipe. Understand?
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Unread postAuthor: Lockednloaded » Tue Mar 16, 2010 12:11 pm

Thanks jrrdw, tha was exactly what i was looking for.
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